CN114024319A - Three-phase voltage treatment method and system - Google Patents
Three-phase voltage treatment method and system Download PDFInfo
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- CN114024319A CN114024319A CN202111355560.5A CN202111355560A CN114024319A CN 114024319 A CN114024319 A CN 114024319A CN 202111355560 A CN202111355560 A CN 202111355560A CN 114024319 A CN114024319 A CN 114024319A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the technical field of low-voltage treatment of power quality, and discloses a three-phase voltage treatment method and a three-phase voltage treatment system, wherein the method comprises the steps of firstly determining a user group with voltage lower than a preset voltage value; determining the rated capacity of the symmetrical bridge type pressure regulating device, and determining the contract capacity of each user in the user group according to the rated capacity; determining an area to be treated according to the contract capacity and the rated capacity; and the symmetrical bridge type voltage regulating device is adopted to supply power to the users in the area to be treated by extracting and releasing the electric energy. Therefore, the low-voltage area of the transformer area is treated by adopting the symmetrical bridge type voltage regulating device, and the lifting and improvement of the user voltage can be realized.
Description
Technical Field
The invention relates to the technical field of low-voltage treatment of power quality, in particular to a three-phase voltage treatment method and a three-phase voltage treatment system.
Background
Along with the improvement of the living standard of people, the household appliances of users are more and more, and the power consumption is more and more. As the power consumption increases, the original distribution line may be thinner or longer, and thus the problem of insufficient voltage of the user may easily occur. Therefore, the line transformation needs to be carried out on the transformer area, but the labor and time cost needed by the line transformation is very high, the line transformation work can be carried out after a long time is needed, the number of power failure days is too long in the line transformation process, and the electricity utilization and life of users are seriously influenced.
Therefore, how to realize effective treatment of the low-voltage area of the platform area becomes an urgent problem to be solved.
Disclosure of Invention
The invention provides a three-phase voltage treatment method, which aims to solve the problems in the prior art.
In order to achieve the purpose, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a three-phase voltage treatment method, which is applied to a treatment system, wherein the treatment system comprises a symmetrical bridge type voltage regulation device, the symmetrical bridge type voltage regulation device is connected in series to the head end of an area to be treated, and the method comprises:
determining a user group with voltage lower than a preset voltage value;
determining the rated capacity of the symmetrical bridge type pressure regulating device, and determining the contract capacity of each user in the user group according to the rated capacity;
determining the area to be treated according to the contract capacity and the rated capacity;
the symmetrical bridge type voltage regulating device is adopted to supply power to the users in the area to be treated through the extraction of electric energy and the release of the electric energy.
Optionally, the determining the contract capacity of each user in the user group according to the rated capacity includes:
setting the contract capacity to be 1.5 to 2 times the rated capacity.
Optionally, symmetry bridge type regulator includes rectifier module and contravariant module, rectifier module with the contravariant module passes through the busbar connection, symmetry bridge type regulator is right through the extraction to the electric energy and the release of electric energy treat that the regional user of administering supplies power, include:
the rectification module performs a rectification process, the rectification process comprises converting alternating current into direct current to charge a bus, the inversion module performs an inversion process, and the inversion process comprises converting the direct current into the alternating current by using the voltage of the bus;
the rectification process and the inversion process are carried out simultaneously, and three-phase input current is consistent in the rectification process.
Optionally, the method further comprises:
acquiring voltage and current within a preset range of the installation position of the symmetrical bridge type voltage regulating device, and acquiring voltage and current of the area to be treated;
calculating the three-phase unbalance degree of the branch according to the voltage and the current in the preset range and the voltage and the current of the area to be treated;
and under the condition that the three-phase unbalance of the branch exceeds the preset unbalance, carrying out three-phase unbalance treatment on the branch so as to balance the input voltage of the voltage regulating device.
Optionally, the preset range is a range of 50m to 100m of the installation position of the symmetric bridge type voltage regulating device.
Optionally, the determining the area to be treated according to the contract capacity and the rated capacity includes:
and determining the region to which the user with the contract capacity within the range of 1.5-2 times of the rated capacity belongs as the region to be treated, and determining the region corresponding to the user with the voltage higher than the preset value as the region outside the region to be treated.
Optionally, the symmetric bridge type voltage regulating device is controlled to be in a state of suspending operation within a preset time period.
In a second aspect, there is also provided a three-phase voltage treatment system, the voltage control system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the computer program.
Has the advantages that:
the invention provides a three-phase voltage treatment method, which is applied to a treatment system, wherein the treatment system comprises a symmetrical bridge type voltage regulating device, the symmetrical bridge type voltage regulating device is connected to the head end of an area to be treated in series, and the method comprises the steps of firstly determining a user group with the voltage lower than a preset voltage value; determining the rated capacity of the symmetrical bridge type pressure regulating device, and determining the contract capacity of each user in the user group according to the rated capacity; determining an area to be treated according to the contract capacity and the rated capacity; and the symmetrical bridge type voltage regulating device is adopted to supply power to the users in the area to be treated by extracting and releasing the electric energy. Therefore, the low-voltage area of the transformer area is treated by adopting the symmetrical bridge type voltage regulating device, and the lifting and improvement of the user voltage can be realized.
Drawings
FIG. 1 is a flow chart of a three-phase voltage remediation method according to a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection of a symmetrical bridge voltage regulator according to a preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of a three-phase voltage governing field pilot effect according to a preferred embodiment of the present invention;
fig. 4 is a circuit diagram of a rectifying module and an inverting module according to a preferred embodiment of the present invention.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present application provides a three-phase voltage treatment method, which is applied to a treatment system, where the treatment system includes a symmetric bridge type voltage regulating device, and the symmetric bridge type voltage regulating device is connected in series to a head end of an area to be treated, as shown in fig. 2, the three-phase voltage treatment method includes:
And 102, determining the rated capacity of the symmetrical bridge type pressure regulating device, and determining the contract capacity of each user in the user group according to the rated capacity.
And 103, determining the area to be treated according to the contract capacity and the rated capacity.
And 104, adopting a symmetrical bridge type voltage regulating device to supply power to users in the area to be treated by extracting and releasing electric energy.
According to the three-phase voltage treatment method, the low-voltage area of the transformer area is treated by adopting the symmetrical bridge type voltage regulating device, so that the voltage of a user can be lifted and improved.
Optionally, determining the contract capacity of each user in the user group according to the rated capacity includes:
the contract capacity is set to 1.5 to 2 times the rated capacity.
For example, the contract capacity is set to 1.5 times the rated capacity, or the contract capacity is set to 1.7 times the rated capacity, or the contract capacity is set to 2 times the rated capacity. The relationship between the contract capacity and the rated capacity may be adjusted within a certain range in other possible embodiments.
Optionally, symmetry bridge type regulator includes rectifier module and contravariant module, and rectifier module and contravariant module pass through the bus connection, and symmetry bridge type regulator supplies power through the release to the extraction of electric energy and electric energy, treats the regional user of administering, includes:
the rectification module performs a rectification process, the rectification process comprises converting alternating current into direct current to charge a bus, the inversion module performs an inversion process, and the inversion process comprises converting the direct current into the alternating current by using the voltage of the bus;
the rectification process and the inversion process are carried out simultaneously, and in the rectification process, three-phase input currents are consistent.
In this optional embodiment, the symmetric bridge type voltage regulating device is divided into a rectifying module and an inverting module, wherein the rectifying module converts the input ac voltage into a dc voltage to provide power for the inverting module; the inversion module outputs alternating voltage and directly provides electric energy for users; the rectification module and the inversion module are both provided with LCL modules for filtering high-frequency harmonic waves; the rectification module and the inversion module are connected into a whole through a bus. In other words, since the area of voltage regulation is the area behind the voltage regulating device, the voltage regulating device is at the head end of the area to be regulated; the rectifier module is a device for converting alternating current into direct current, the inverter module is a device for converting direct current into alternating current, and the direct current part between the rectifier module and the inverter module is a bus capacitor. The bus is charged through the rectifying module, the function of inversion is realized by using the voltage of the bus, and the rectifying process and the inversion process are carried out simultaneously to realize the output of compensation voltage.
Optionally, the three-phase voltage governance method further includes:
acquiring voltage and current within a preset range of the installation position of the symmetrical bridge type voltage regulating device, and acquiring voltage and current of an area to be treated;
calculating the three-phase unbalance degree of the branch according to the voltage and the current in the preset range and the voltage and the current of the area to be treated;
and under the condition that the three-phase unbalance of the branch exceeds the preset unbalance, performing three-phase unbalance treatment on the branch so as to balance the input voltage of the voltage regulating device.
Optionally, the preset range is a range of 50m to 100m of the installation position of the symmetrical bridge type voltage regulating device.
In the alternative embodiment, the voltage and the current in the treatment area are measured in an area which is relatively close to the installation position of the measuring equipment, for example, the voltage and the current in 50m or the voltage and the current in 100m, if the branch has serious three-phase imbalance problems, for example, the requirement that the three-phase imbalance degree is far higher than 25 percent, and the three-phase current is in a larger magnitude relative to the whole platform area, the three-phase imbalance treatment is carried out on the branch, so that the use capacity of the voltage regulating device is reduced.
Specifically, the three-phase imbalance management needs to consider imbalance of input of the voltage regulating device caused by imbalance of a front-end line, the front-end imbalance management aims to balance input voltage of the voltage regulating device, imbalance of user voltage caused by imbalance of power consumption of an area behind a management point needs to be considered, and the rear-end imbalance management is to ensure that difference of the user voltage of different phases is small. Because the line of the treatment area is slender, and the serious problem of three-phase imbalance exists, the zero line current is too high, the voltage of the end user is unbalanced, the voltage of the one-phase user with large current is low, and the voltage compensation needs to be carried out by combining a distributed three-phase imbalance treatment device at the moment.
Optionally, determining the area to be treated according to the contract capacity and the rated capacity comprises:
and determining the region to which the user with the contract capacity within the range of 1.5-2 times of the rated capacity belongs as the region to be treated, and determining the region corresponding to the user with the voltage higher than the preset value as the region outside the region to be treated.
In this alternative embodiment, the abatement zone is determined based not only on the low voltage user group being within the abatement zone, but also on ensuring that the voltage of users not within the abatement zone is high, e.g., above 205V. Because the symmetrical bridge voltage regulating device is arranged at the front end of the low-voltage user group, the voltage of the whole treatment area is improved to a certain extent, and meanwhile, the voltage of the front end can be reduced to a certain extent, and the voltage of the front end of the symmetrical bridge voltage regulating device is preferably ensured to be more than 205V in consideration of the voltage adaptability of the household appliance, so that the influence on the front end user is small while the voltage user group is improved, and the electricity utilization of the front end user and the front end user is balanced; meanwhile, the problem of unbalanced three phases of a user is considered, unbalanced three phases are treated in an area with serious unbalance, voltage drop on a line is balanced, overlarge three-phase voltage deviation can be avoided, and the voltage lifting effect and the safe operation of equipment are facilitated.
Optionally, the symmetric bridge type voltage regulating device is controlled to be in a state of suspending operation within a preset time period.
In the optional embodiment, considering the economical efficiency of line loss and the importance in assessment, the lowest line loss is ensured as much as possible while voltage is managed, so that the device can be turned off at 0:00 and turned on at 6:00 by adopting the function of timing on-off according to the peak-valley characteristics of power consumption.
In one example, in combination with an actual test point, a schematic diagram of a voltage control field test point effect of a symmetrical bridge type voltage regulating device is shown in fig. 3, data is voltage data of an equipment mounting point, a very obvious dividing line in fig. 3 is provided, a voltage regulator compensates front voltage before the dividing line, a voltage regulator compensates rear voltage after the dividing line, and by comparing voltage trend diagrams of the two, it can be seen that the three-phase voltage of the equipment mounting point before voltage regulation is quite unbalanced, the phase voltage of a phase is lowest and is less than 200V, the phase voltage of B phase can reach more than 220V, and the lowest voltage of the tail end of the phase a can be below 180V or even 170V in combination with a field environment; after voltage regulation, three-phase voltages of the installation points are balanced and are 240V, and the lowest voltage of the tail end is more than 200V, so that the obvious voltage lifting effect of the symmetrical bridge type voltage regulation device can be seen.
The embodiment of the application still provides a three-phase voltage treatment system, treatment system includes symmetrical bridge type regulator, symmetrical bridge type regulator establishes ties to the head end of treating treatment region, symmetrical bridge type regulator is used for through the extraction to the electric energy and the release of electric energy, right treat that the regional user of treatment supplies power.
The symmetrical bridge type voltage regulating device is divided into a rectifying module and an inverting module, wherein the rectifying module converts input alternating voltage into direct voltage and provides power for the inverting module; the inversion module outputs alternating voltage and directly provides electric energy for users; the rectification module and the inversion module are both provided with LCL modules for filtering high-frequency harmonic waves; the rectification module and the inversion module are connected into a whole through a bus, as shown in fig. 4.
The three-phase voltage treatment system can realize each embodiment of the three-phase voltage treatment method, and can achieve the same beneficial effects, and the details are not repeated here.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. The utility model provides a three-phase voltage treatment method, is applied to treatment system, its characterized in that, treatment system includes symmetrical bridge type regulator, symmetrical bridge type regulator establishes ties to the head end of treating the treatment area, the method includes:
determining a user group with voltage lower than a preset voltage value;
determining the rated capacity of the symmetrical bridge type pressure regulating device, and determining the contract capacity of each user in the user group according to the rated capacity;
determining the area to be treated according to the contract capacity and the rated capacity;
the symmetrical bridge type voltage regulating device is adopted to supply power to the users in the area to be treated through the extraction of electric energy and the release of the electric energy.
2. The three-phase voltage governance method of claim 1, wherein said determining a contracted capacity for each user in the user group based on the rated capacity comprises:
setting the contract capacity to be 1.5 to 2 times the rated capacity.
3. The three-phase voltage governance method according to claim 1, wherein the symmetrical bridge voltage regulation device comprises a rectification module and an inversion module, the rectification module and the inversion module are connected through a bus, and the symmetrical bridge voltage regulation device supplies power to users in the area to be governed by extracting and releasing electric energy, and comprises:
the rectification module performs a rectification process, the rectification process comprises converting alternating current into direct current to charge a bus, the inversion module performs an inversion process, and the inversion process comprises converting the direct current into the alternating current by using the voltage of the bus;
the rectification process and the inversion process are carried out simultaneously, and three-phase input current is consistent in the rectification process.
4. The three-phase voltage remediation method of claim 1 further comprising:
acquiring voltage and current within a preset range of the installation position of the symmetrical bridge type voltage regulating device, and acquiring voltage and current of the area to be treated;
calculating the three-phase unbalance degree of the branch according to the voltage and the current in the preset range and the voltage and the current of the area to be treated;
and under the condition that the three-phase unbalance of the branch exceeds the preset unbalance, carrying out three-phase unbalance treatment on the branch so as to balance the input voltage of the voltage regulating device.
5. The three-phase voltage governance method according to claim 1, wherein the preset range is a range of 50m to 100m of the installation position of the symmetrical bridge type voltage regulation device.
6. The three-phase voltage remediation method of claim 1, wherein said determining the area to be remediated from the contract capacity and the rated capacity comprises:
and determining the region to which the user with the contract capacity within the range of 1.5-2 times of the rated capacity belongs as the region to be treated, and determining the region corresponding to the user with the voltage higher than the preset value as the region outside the region to be treated.
7. The three-phase voltage governance method according to claim 1, wherein the symmetrical bridge type voltage regulation device is controlled to be in a suspended state within a preset time period.
8. A three-phase voltage treatment system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the computer program implements the steps of the method of any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111355560.5A CN114024319A (en) | 2021-11-16 | 2021-11-16 | Three-phase voltage treatment method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111355560.5A CN114024319A (en) | 2021-11-16 | 2021-11-16 | Three-phase voltage treatment method and system |
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| CN114024319A true CN114024319A (en) | 2022-02-08 |
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| CN202111355560.5A Pending CN114024319A (en) | 2021-11-16 | 2021-11-16 | Three-phase voltage treatment method and system |
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| CN103997043A (en) * | 2014-05-15 | 2014-08-20 | 南京工程学院 | Uniform electricity quality regulator based on T-type three-level inverter and regulating method thereof |
| CN205724912U (en) * | 2016-04-19 | 2016-11-23 | 北京英博电气股份有限公司 | A kind of rural power grids low-voltage controlling device |
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